60 percent of coffee varieties face 'extinction risk'

Coffee is the world's favourite beverage but its wild species—vital for maintaining commercial crop variety—are confined to tiny
Coffee is the world's favourite beverage but its wild species—vital for maintaining commercial crop variety—are confined to tiny areas in Africa and South America

Three in five species of wild coffee are at risk of extinction as a deadly mix of climate change, disease and deforestation puts the future of the world's favourite beverage in jeopardy, new research warned Wednesday.

More than two billion cups of are consumed every day, but the multi-billion-dollar industry is reliant on wild varieties grown in just a few regions to maintain commercial crop variety and adapt to changing threats posed by pests.

Scientists at Britain's Kew Royal Botanic Gardens used the latest computer modelling techniques and on-the-ground research to predict how the 124 coffee varieties listed as endangered might fare as the planet continues to warm and ecosystems are decimated.

Some 75 coffee species were assessed as being threatened with extinction: 13 classed as critically endangered, 40 as endangered, including , and 22 as vulnerable.

"Overall, the fact that the extinction risk across all coffee species was so high—nearly 60 percent—that's way above normal extinction risk figures for plants," Aaron Davis, head of coffee research at Kew, told AFP.

"It's up there with the most endangered plant groups. In another way, it's hardly surprising because a lot of species are hard to find, grow in restricted areas... some have a population only the size of a football pitch."

Global coffee production currently relies on just two species: arabica and robusta.

Arabica, prized for its acidity and flavour, accounts for roughly 60 percent of all coffee sold worldwide. It exists in the wild in just two countries: Ethiopia and South Sudan.

Global coffee production currently relies on just two species
Global coffee production currently relies on just two species

The team at Kew accessed climate data recorded in Ethiopia going back more than 40 years to measure how quickly the coffee's natural habitat was being eroded by deforestation and rising temperatures.

They found that nearly a third of all wild Arabica species were grown outside conservation areas.

"You've also got the fact that a lot of those protected areas are still under threat from deforestation and encroachment, so it doesn't mean they are secure," said Davis, lead author of the research published in the journal Science Advances.

'Fair price'

As well as the inconvenience—not to mention sleepiness—consumers would face from a coffee shortfall, the authors expressed concern over the livelihoods of farmers, many of whom are being forced to relocate as climate change ravages their crops.

"Ethiopia is the home of Arabica coffee," said Tadesse Woldermariam Gole, senior researcher for environment, climate change and coffee at the Forest Forum.

"Given the importance of Arabica coffee to Ethiopia, and the world, we need to do our utmost to understand the risks facing its survival."

Davis said wholesalers needed to ensure producers were paid a fair price so they could future-proof production by investing in better growing practices and conserving a varied stock.

There is no current shortage of one of the world's most valuable commodities
There is no current shortage of one of the world's most valuable commodities

In addition, governments must preserve and regenerate forests to help both wild and farmed coffee grow more easily, said the team behind the research.

Davis was keen to point out however that there is no current shortage of one of the world's most valuable commodities.

"As a coffee drinker you don't need to worry in the short term," he said.

"What we are saying is that in the long term if we don't act now to preserve those key resources we don't have a very bright future for coffee farming."

The new study found the enigmatic coffea stenophylla, known as the highland coffee of Sierra Leone, which is said to surpass arabica in flavour.

It had not been seen in the wild since 1954, and has all but vanished from coffee plantations and botanic gardens.

But a December 2018 expedition to the last known locality found a single plant followed by others after several hours of trekking.


Explore further

Coffee threatened by climate change, disease, pests

More information: A.P. Davis el al., "High extinction risk for wild coffee species and implications for coffee sector sustainability," Science Advances (2018). DOI: 10.1126/sciadv.aav3473 , http://advances.sciencemag.org/content/5/1/eaav3473
Journal information: Science Advances

© 2019 AFP

Citation: 60 percent of coffee varieties face 'extinction risk' (2019, January 16) retrieved 18 November 2019 from https://phys.org/news/2019-01-percent-coffee-varieties-extinction.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
1209 shares

Feedback to editors

User comments